JSFiddle - React, Tailwind, and code Playground

HTML

<div id="Description" contenteditable="true"></div>

CSS

#Description {
height: 500px;
    width: 300px;
    border: 1px solid #000;
}

JavaScript

$(document).on('change', '#Description', function(e) {
    var filenumber = $('#Description img').length;
    alert(filenumber);
});